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  1. Troubles when elevating a LT supply
  2. Turning up the heat: cathode bias
  3. Anyone build Dynaco Mk IIIs with Sullivan boards?
  4. Lowering gain on Frank's 6SN7 preamp
  5. Pro amp input modification
  6. Sanity of compactron for "integrated" headphone amp?
  7. vdc drop
  8. HELP - SMART 845 or 300B SE
  9. DC Servo - Direct Coupling Applications?
  10. Edison 12 amplifier
  11. Mounting terminal strips to blank copper board
  12. 6C33C tube socket for GM70 tube??
  13. Fisher X100C 2 sets speakers?
  14. 4P1L DHT Line Stage
  15. Trying to identify an old radio tube
  16. Yaqin CD3 upgrading caps help for novice
  17. push pull adjustable fixed bias
  18. Another SE amp design.
  19. Chassis to experiment with....
  20. Ray Butts Echosonic #27
  21. Ampeg Reverberocket II Hum
  22. What coupling capacitor values are common
  23. Yamamoto A-09s
  24. 9001 variant of Acorn 954 Pentode
  25. Khron-Hite UHR220 tube power source
  26. Grounding the 4ohm tap
  27. Rectifier mechanical buzz
  28. Informed opinion(s) on phase inversion?
  29. Computer grade electrolytics
  30. Strange problem with Grundig CS200 tube receiver
  31. Puresound P10 RIAA
  32. Need help on DIY Toccata Phono Preamp
  33. Single 6EB8 tube kit?
  34. SE OPT as PS choke
  35. Best input DHT tube?
  36. Stainless Steel Chassis Polishing
  37. Hm, which order to replace 2 out of 4 tubes?
  38. EL34 Musical Machine Output XFMR suggestions
  39. Driver stage to finals newbie questions - (I hope not dumb questions)
  40. Preamp with single 12ax7 Ecc83 for stereo?
  41. Ming-Da MC-300B845 schematic needed
  42. My RH84 Build - first amp after a 25 year break -:)
  43. Jolida 502a Snubber Mod
  44. Again
  45. KT120, PSE
  46. 6v6 bias with cathodyne
  47. How did the "magic eye" work on old valve radios ?
  48. High voltage switching
  49. High voltage switching
  50. EF184 as ccs / design questions / spice model
  51. ECC807
  52. Chassis thickness
  53. Compactron 6C10 & 6Q11/6K11 tube data
  54. Output voltage guitar preamp
  55. Reverse Engineering leads from Tube amp
  56. Did you all see this??
  57. WESTREX 60 WATT AMP
  58. Johari's audio system
  59. el95 single ended amp project needs help with preamp
  60. SS Rectifers and Zero-Crossing Distortion, possible fix or idotic idea?
  61. 3 ways active crossover
  62. 5691 tube tonal balance
  63. Dynaco Mark III chassis
  64. variac - breadboard with choke input
  65. Stancor A-8053 Output Transformer - opinions wanted!
  66. Nice OPT's for headphone amp...
  67. Eimac 304TH anode question
  68. Is WE310A > 45 > 300B PP possible?
  69. Aikido 5687 PCB - Headphone and C3
  70. Twist-lok caps?
  71. Tube RIAA(something easy)
  72. Testing power pentodes
  73. NTC THERMISTOR as SOFT START for TUBES
  74. NEW ARIA (MENG) MINI 6P1
  75. Basic schematic for Dodd Audio tube buffer?
  76. EL844
  77. 3 channel all tube preamp pedal w/fx loops for all clone build
  78. Tube CAD?
  79. Cap Problem with philco 49-1401
  80. Music Angel
  81. Help 7189A Tubes!
  82. Bulb in cathode?
  83. Gain and volume pots - newbie question
  84. Resistor test TX7525 AMRG CMF55
  85. I think I made a mistake
  86. 12at7 and 12au7
  87. PSE KT88 using Mikael's basic schematic.....
  88. PSU sanity check - negative rail?
  89. Mods Tube Amps/Pre-amp
  90. Help to find out what OPT are these
  91. LL1660 P PZ Lundahl interstage ringing problem GM70pp
  92. Possible PS chokes
  93. Adding Bal output to Akido
  94. Input impedance, the higher the better or not?
  95. Risk of DC coupled input with tube pre-amp ?
  96. UL Cascode phono
  97. DC Imbalance with the LTP
  98. More Wireless World articles archived
  99. Yaqin VK-2100 Static from one channel
  100. Direct Coupled, Self Biasing, CCS Loaded, 300B Amp
  101. Testing a 300A on a B&K
  102. Diodes to tube
  103. PL84/EL86 push pull
  104. circuit diagram
  105. Ultralinear operation
  106. 60hz hum in component system
  107. Crackling Amp
  108. Regulated Supply for Direct Coupled Amp
  109. Explanation wanted
  110. Dynaco FM1 stereo updating ?
  111. tube amp diy off. Is this a good deal?
  112. SE driver
  113. DN2540 + LM317 cascode CCS?
  114. Recapping old tube amp
  115. How a SRPP stage sounds like?
  116. Help troubleshooting SE Pentode amp
  117. What meter for Bias?
  118. Mains tranformer noise
  119. Tube tester block diagram
  120. got a custom 829b amp that i got laying around, need to know what driver to use
  121. Universal filament regulator
  122. ECC88 - 6DJ8 Cascode Plate Curves
  123. Gain of Phase Inverter
  124. CF/CCS, can it be made simpler?
  125. 2A3 Heater Hum Pot
  126. Need help - black out while the amp. was on
  127. simple question about cathodyne PI
  128. Where can I get a cover for the OPT and PS
  129. Power supply for heater
  130. how to use oscilloscope
  131. I am collecting parts for my 200w mono amps "But"
  132. This seems wrong?
  133. StoetKit Junior Schematics
  134. Valve Amplifiers 3rd edition Errata
  135. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  136. 6v6 datasheet
  137. Leaving filaments on?
  138. output caps -- your observations, pleeze
  139. Low gain preamp.
  140. Recommended Tube/Valve references?
  141. Stand Alone guitar power amp
  142. Tube Socket Identification
  143. Some agreement on reasonable affordable and well performing design builds?
  144. Fletcher cooke OTL article
  145. I have 4 Pl504's. Are they best used as SE or PP ?
  146. More k12g amp musings
  147. How preserve loudness circuit with new volume pot?
  148. Where to find 212E tubes???
  149. Music Angel XD-SE EL34 Amp
  150. CV345 VS EL34
  151. Reducing Filment Hum in Tubes
  152. push pull power amp
  153. 6 ohm speakers....
  154. Need a 12.6 VDC power supply schematic
  155. Gold Lion KT88 Issue
  156. Plate currents in P-P
  157. Bass preamp + Edcor balanced out = HUM!
  158. Testing amplifiers with computer software...
  159. Welborn Labs - Abysmal Service
  160. Repairing broken pins on valuable tube...
  161. Explain how feedback affects DF?
  162. Low emissions
  163. Tube Blue Glow question
  164. Common-mode choke before or after?
  165. 6l6 data sheet question
  166. Mic preamp
  167. Physical Tube Diagnosis?
  168. how and why power amps clip
  169. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  170. Vacuum Tube OTL power amp!!
  171. Tube replacement options.....
  172. balanced RIAA amp
  173. power amp distortion
  174. Suggestions for 5k5 40W iron?
  175. Peavey Classic 30 Reverb headscratcher...
  176. Schematic Tube Analog Output Stage???
  177. 300B 'direct drive' using a 6U8..
  178. Magnavox 88-02 power trans ratings?
  179. Preamp with humming noise!
  180. How to choose line out transformer?
  181. Tools for Cutting Tube Socket Holes?
  182. Switchable SE.
  183. GZ33 in place of 5U4 can it be done?
  184. phase splitter issue
  185. Armstrong A10 MK2 EL34 mono block
  186. "Ug" The Transformer
  187. i think its time i start playing with caps
  188. problems with preamp on home brew
  189. LS180 Tube Socket?
  190. simple question - 5V heater power supply
  191. Lineamp
  192. FI AUDİO 421 A
  193. Pete Millett has another Red Board for sale
  194. Jolida JD9 Problem
  195. 6N11 = 6N1P ?
  196. K12-G tube amp problem
  197. Please vote for one of the schematics.
  198. Advantages of separate PS for input and output stages
  199. Another PCB tube amp design
  200. Help. Replacement OPT sqrueeechhh.
  201. New concept of a power amp
  202. Lundahl and rectifier mismatch?
  203. Resurrecting weak tubes
  204. Best DHT heater?
  205. Help requested for EL84 SET amp
  206. What did I buy??
  207. Edcor and Custom Power Transformer Design
  208. What would you make with this power TX?
  209. Lundahl 1676
  210. DHT for 300B problem
  211. Newbie question about output transformer to speaker matching
  212. Red board add-on phono/RIAA pre-amp
  213. 2 Chassis amp
  214. Is It posible to bridge two quad II monoblocks?
  215. Power tube at work picture
  216. Tube SE power amp , which one??
  217. Hickok 539A issue
  218. Noise in one channel? Pioneer SX-400
  219. Hartung / Prestla OTL amps
  220. Lafayette Model 417
  221. Extreme plate load
  222. What do you think about this idea
  223. el84pse schem, need advice
  224. Video pentodes as outputs
  225. Custom Vibrolux Reverb noise issue
  226. Chinese "Audio Research" KT88s
  227. Fender bandmaster rectifire problem.
  228. New 6C33 Socket
  229. 2a3 PP output transformer
  230. PSU problem - Murphy is an ***hole!
  231. Best SET design?
  232. Anybody ever tried EBC41 as 12AX7 substitute?
  233. The 7242
  234. 12bh7a
  235. Phase Splitter Help
  236. Oscilloscope Question
  237. sizing opt
  238. 6P3C-E Datasheet help
  239. on the toroids again
  240. OPT problem or Something else 6L6 PP
  241. Look what I found!
  242. Help, Diy tube amp
  243. Idea
  244. a few DIY tube amplifier setups
  245. 6L6 PP amp motorboating
  246. Mayer-inspired 4P1L
  247. 6L6 WGB 2X34W STEREO AMPL
  248. Isolation transformation wiring project help
  249. Tube Amp DIY or Retail
  250. Supplier for GU50 tubes

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